5 results about "N-butyl nitrite" patented technology

This invention discloses a solution-based synergistic catalytic method for preparing post-functionalized polyolefins, belonging to the field of polymer material modification technology. The method includes the following preparation steps: adding polyolefin, graft monomer, and catalyst to an organic solvent, stirring until homogeneous, and heating to react, thereby obtaining the post-functionalized polyolefin; wherein the catalyst is a combination of a first catalyst and a second catalyst; and the first catalyst is selected from tert-butyl nitrite, and the second catalyst is selected from N-hydroxysuccinimide and / or N-hydroxyphthalimide. This invention utilizes a synergistic catalytic system composed of tert-butyl nitrite and N-hydroxysuccinimide and / or N-hydroxyphthalimide to activate the C-H bonds of polyolefins in an organic solvent via a free radical mechanism, thereby grafting polar functionalized graft monomers onto the main chain of various polyolefins.

This invention discloses the application of a thiazo[a]thiazolium fluorescent derivative in the sensing and detection of butyl nitrite. This fluorescent derivative uses the electron-deficient thiazo[a]thiazolium group as the core, with symmetrically connected at both ends a benzene ring with a typical "propeller" conformation and methoxylated triphenylamine at the para- or ortho-position as electron donors, forming a D-A-D type structure. This derivative exhibits high fluorescence quantum yield, excellent intramolecular charge transfer (ICT) characteristics, and good photophysical properties, demonstrating excellent sensing performance for butyl nitrite, including high sensitivity, fast response speed, and short recovery time. Furthermore, this fluorescent derivative is prepared into a fluorescent sensing film with good photochemical stability using a drop-coating method, and then assembled into a device to construct a thin-film fluorescent sensor, demonstrating significant application potential and practical value in the high-sensitivity detection of butyl nitrite.

This invention discloses a 4-(formaldehyde oxime)-fluoro-2-quinolinone compound and its synthetic method, belonging to the fields of organic synthetic chemistry and medicinal chemistry. Using halogen-containing fluoro-N-(2-vinylphenyl)acetamide compounds as starting materials, this invention utilizes a visible light-induced tandem cyclization reaction to obtain 4-(formaldehyde oxime)-fluoro-2-quinolinone compounds in high yield. This invention employs greener and cleaner visible light as an energy source and uses inexpensive and readily available tert-butyl nitrite and trimethylamine borane as dual-role reagents (hydrogen transfer reagent and oxime source) and halogen atom transfer reagent, respectively, avoiding the use of expensive transition metal catalysts. The raw materials are simple and readily available, the process is environmentally friendly, and the target product yield is high.

The application discloses a method for preparing post-functionalized polyolefin by melt method and synergistic catalysis, and belongs to the technical field of polymer material modification. m The grafting reaction is carried out, extrusion and cooling are performed, and the post-functionalized polyolefin is obtained; wherein the catalyst is selected from the combination of tert-butyl nitrite and N-hydroxyphthalimide. The application realizes efficient and high-selectivity graft modification of the polyolefin under the melt processing condition by utilizing the synergistic catalysis of tert-butyl nitrite and N-hydroxyphthalimide, effectively inhibits degradation side reactions, and maintains excellent performance of the base material.

This invention relates to the field of organic synthesis technology and discloses a high-yield synthesis method for benzofuran-2,3-dione 3-(O-methyloxime)2-oxime. The method uses o-hydroxyacetophenone as the starting material and includes the following steps: Step 1, the starting material is refluxed with N,N-dimethylformamide dimethyl acetal in an aromatic hydrocarbon solvent to obtain an enamine ketone intermediate; Step 2, the enamine ketone intermediate is nitrosated and oxidatively cyclized using sodium nitrite and tert-butyl nitrite in a ketone solvent; Step 3, the cyclized product is reacted with methoxyamine hydrochloride in an alcohol solvent to obtain the target product. This invention avoids the use of hazardous reagents such as sodium hydride and concentrated nitric acid by constructing an enamine ketone intermediate and employing a mild two-component nitrosation system. The reaction conditions are mild, and post-processing only requires solid-liquid separation. This method has the advantages of high yield, good purity, high safety, and simple operation, making it suitable for industrial production.